Machine for crimping pipe sleeves



' June 16, 1931.

A. J. BULGER MACHINE FOR CRIMPING PIPE SLEEVES Filed July 24. 1930[NVENTOR A TTORNE V Patented June 16, 1931 UNITED STATES; rarer QFFICEARTHURJ'. BULGER, or BROOKLYN, new roan, ASSIGNOR T Pruner; STEELLPILEicon PORATION, on NEW YORK, N. Y.

, A COREORATIQN OF. NEW YORK MACHINE FOR CRIIEPING PIPE SLEEVESApplication filed. July 24,

This invention relates to an improved machine for forming a centralinternal crimp or bend in a short length of pipe, in the manufacture ofcouplings used principally for connecting sections of pipe piles.Rolling mills for rolling an internal grooved bend, which issubsequently closed by endwise pressure applied to the sleeve, aredisclosed in the Pierce Patents 1,602,550 and 1,633,349.

The objects of the invention are to make possible far greater output, toreduce wear and replacements very materially, to insure the productionof perfectly formed crimps in the sleeves, to facilitate the placementand removal ofthe sleeves over the mandrel roll,

and to provide a machine of generally improved design.

In-the machines which have been in use up to this time for groovingthese sleeves, power was applied to a pair of rolls having beadsintermediate their ends, and the grooved mandrel roll, which was locatedover these rolls and could be raised and depressed, was an idler roll. Aprimary feature of my machine is. thatv the centrallygrooved mandrelroll is the driven roll. The result of this is that line contact isobtained between the sleeve and the roll which turns it, whereas in theprior machines the beads rotated the sleeve through point contact' Thischange eliminates alarge amount of slippage and wear, which formerlynecessitated replacement "of the beads every two or three days, andpractically doubles the production obtainable witha machine. Inthepresent machine the crimping elements are free to roll and are driven bythe sleeve, so that the wear on these elements is reduced to theminimum,

' whereas between the sleeve andthe driven mandrel roll within there isline contact, ap-

1930. Serial No. 470,379.

as faras wear is concerned becauserthe wear is distributed over thecylindrical surface-of this roll.

In my new machine the mandrel roll'is preferablymounted in the framebelow the In the accompanying drawi11gs,;forming;

part hereof: I e 1 Fig. l 1521. view of the machine, prmclpally 1ncentral vertical-section, showing the'crnnping rolls pressed against asleeve on the man drel roll; I V

Fig. 2 is a similar view showing the vertically movable parts raised andis a section taken on the line 83 of Fig. 1. i

The frame of the machine has side members 2,. 3 formed, respectively,with recesses 4, 5 in which bearings 6, 7 are supported and are guidedfor vertical movement, the recesses being open at the top. The recess 4and the corresponding bearing 6 are longer :than the. recess 5 and thebearing 7, so that When these bearings are raised equally the hearing 6will rema iniin engagement with its guide whenthe bearing 7.is free ofthe frame.

'The mandrel roll has a central circular groove 8 in which to form theinternal crimp 9 of the sleeve 10.

The shaft or-journals 11 of the mandrelroll pass through the bearings 6,'7, an'd'the end of the shaftor journal outside theb-earing 6 isprovided with a gear'12, which, when the bearings rest on the bottoms ofthe recesses 4c, 5, is in mesh with another gear 13 on a shaft 14journaled in the stationary frame. The driving power is transmitted tothis shaft and thence to the mandrel roll.

Over the'mandrel roll there is a vertically movable carriage 15 carryinga pair of narrow crimping rolls or discs 16 on axles 17. This carriageis fixed to the lower end of a piston-rod 18 which extends downward froma piston 19 in a double-acting hydraulic cylinder 20, by means of whichthe crimping rolls can be pressed downward against a sleeve on themandrel roll, and can be raised away from the mandrel roll when theoperation of forming the crimp has been finished.

A yoke 21 having an opening loosely encircling the piston-rod, so thatthe downward movement of the piston-rod and crimpingroll carriage doesnot apply downward pressure to the yoke, is raised by the carriage aftera portion of its upward movement has taken place, and this lift istransmitted through a rod 22 to the bearing 6, to lift the mandrel rollsufliciently to carry the bearing 7 above the frame member 3. In thisposition, the crimped sleeve is removed and an uncrimped sleeve isslipped over the mandrel roll. The bearing 7 is preferably made smallenough so that it does not have to be removed from the shaft or journalof the mandrel roll when this is done.

While the preferred embodiment of the invention has been described withparticularity, it will be understood that changes in form, arrangement,and detail are permissible.

I claim:

1. A machine for crimping pipe sleeves, comprising a frame, a mandrelroll having a groove intermediate its ends, said roll being mounted inthe frame so that it can be raised to permit placement and removal ofthe sleeves over it, means for driving the mandrel roll, crimping rollsand a crimping roll carriage over the mandrel roll, means for pressingsaid crimping roll carriage downward and for raising it, and aconnection whereby this means also serves to raise the mandrel roll.

2. A machine for crimping pipe sleeves, comprising a frame, a mandrelroll having a groove intermediate its ends, said roll being mounted inthe frame so that it can be raised to permit placement and removal ofthe sleeves over it, means for driving the mandrel roll, crimping rollsand a crimping roll carriage over the mandrel roll, a double-actingfluid-pressure cylinder and piston with a piston-rod connected to saidcarriage for pressing the same downward and for raising it, and a yokeloose on said piston-rod for transmitting lift to the mandrel roll.

ARTHUR J. BULGER.

